Now Playing: Author Deepak Chopra discusses his new book 'Home'

Now Playing: What's in Deepak Chopra's Wallet?

Now Playing: ABC News' Dan Harris on his new book, 'Meditation for Fidgety Skeptics'

Now Playing: Deepak Chopra: 'We are dictating our insanity'

Now Playing: Dietitian tips to stay on course with New Year's resolutions

Now Playing: Health tips to safely participate in Dry January

Now Playing: How to develop a safe workout routine this year

Now Playing: Best diets for 2018 from US News and World Report

Now Playing: Dry January: Taking a month-long break from alcohol

Now Playing: Time-restricted feeding touted as weight loss strategy

Now Playing: Rejuvenation nation: Expert health and wellness tips to kick off the new year

Now Playing: Top 3 health tips for a strong mind and body in the new year

Now Playing: Dan Harris aims to make the practice of meditation more accessible to everyone

Now Playing: Flu season is getting worse and fast: CDC

Now Playing: Mother, doctors recount emotional journey of boy's life-changing surgery

Now Playing: Study finds there has been a spike in pregnant women using marijuana

Now Playing: Woman gives birth inside California market

Now Playing: Supplements may not lower fracture risk: Study

Now Playing: What to know about the trendy new 'Personalized Diet'

Now Playing: Arizona police chief introduces officers to meditation